The most anticipated episode of That Time I Got Reincarnated as a Slime Season 4 has finally arrived, and Episode 10 delivered one of the biggest twists in the series so far. The episode, which aired on Friday, June 12, 2026, completely changed the playing field by exposing Yuuki Kagurazaka as the true mastermind behind recent events.
Fans who tuned in expecting a straightforward showdown between Rimuru Tempest and Mariabell Rosso got something much bigger. What looked like a battle against a spoiled, powerful noble turned out to be the unveiling of a far more dangerous enemy.
Release Date and Where to Watch
Episode 10 premiered on June 12, 2026, at approximately 12:00 a.m. JST in Japan. For international viewers, the episode became available on Crunchyroll at the following times:
- Pacific Time (PDT): 8:00 AM
- Eastern Time (EDT): 11:00 AM
- British Summer Time (BST): 4:00 PM
- India Standard Time (IST): 8:30 PM
Rimuru vs. Mariabell: The Greed User Underestimates Her Opponent
The episode kicked off right where the previous installment left off, with Mariabell Rosso confronting Rimuru directly. Mariabell, the granddaughter of Granville Rozzo, had been built up as the season’s primary antagonist. Her unique skill, Greed, gave her the ability to control others and manipulate events from behind the scenes. She was confident, powerful, and utterly convinced that she had already won.
At first, Mariabell charged at Rimuru with full force, believing her abilities would easily overpower the Demon Lord. She had every reason to be confident—her schemes had worked flawlessly up to this point.
However, Mariabell had made one critical mistake: she heavily underestimated Rimuru. Throughout the battle, Rimuru remained calm and collected, counterattacking and nullifying her moves with precision. He had already gathered enough information about her powers and knew exactly how to fight back.
Mariabell started the fight incredibly confident in her powers. But as the battle continued, she slowly realized there was almost no chance for her to defeat Rimuru. Her confidence turned into desperation.
The fight served as a powerful reminder of how far Rimuru has come since the series began. He is no longer the naive slime who was figuring things out as he went. He is a seasoned Demon Lord who has faced world-ending threats and emerged victorious.
The Shocking Truth: Yuuki Was Never Controlled
While the battle with Mariabell was entertaining, the episode’s real shock came afterward.
Throughout the season, Yuuki Kagurazaka appeared to be under Mariabell’s control. Even Rimuru and his team believed that Yuuki was one of her victims, helpless against the power of Greed. Mariabell thought she was pulling the strings, using Yuuki as a pawn in her larger game.
But Episode 10 revealed that everything was a lie.
Yuuki was never truly under Mariabell’s control. He had been pretending all along, playing the role of a helpless victim while waiting for the perfect opportunity to advance his own ambitions. Every move Mariabell made, every scheme she thought she was orchestrating—Yuuki was several steps ahead, using her as a pawn in his own game.
How Yuuki Resisted Greed
For fans familiar with the source material, Yuuki’s resistance to Mariabell’s Greed skill has a deeper explanation. According to character analysis sources, Yuuki was able to resist Mariabell’s control through his stronger desires. His ambition and willpower were simply too powerful for Greed to fully dominate.
This detail makes the betrayal even more chilling. Yuuki wasn’t just pretending—he was actively fighting off mental control through sheer force of will, all while maintaining the act of being a victim.
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The Season’s Most Shocking Betrayal
The biggest moment of the episode arrived in the aftermath of Mariabell’s defeat. Just when it seemed like the conflict was over and the heroes had won, Yuuki revealed his true intentions.
Without hesitation, Yuuki turned against Mariabell and eliminated her himself. Calmly and coldly, he disposed of the woman who thought she was controlling him, proving once and for all who the real threat was.
Then came his declaration: he wants to become the King of the World.
In that single moment, Yuuki transformed from a suspicious ally into one of the series’ most dangerous antagonists. Mariabell, for all her scheming and power, was nothing more than a pawn—a tool Yuuki used to further his own plans before discarding her when she was no longer useful.
What This Means for the Rest of the Season
With Mariabell eliminated and Yuuki now openly declaring his ambitions, the stakes for the remainder of Season 4 have skyrocketed.
The episode also set up future conflicts, with the Chaos Dragon battle now on the horizon. Yuuki’s betrayal opens up several major questions:
- How will Rimuru and his allies respond to this betrayal?
- What are Yuuki’s true goals, and how far is he willing to go to achieve them?
- Who else has been working for Yuuki without anyone knowing?
Additionally, fans are now speculating about how this betrayal connects to other ongoing storylines, including Leon’s goals in El Dorado and the awakening of a new Hero.
Final Thoughts
Episode 10 of That Time I Got Reincarnated as a Slime Season 4 was a game-changer. What started as a season focused on Mariabell’s schemes has now pivoted to a much more personal and dangerous threat.
The episode’s animation quality was top-notch, and the battle sequences delivered the high-energy action fans expect from the series. But the real highlight was the storytelling—the slow-burn reveal that Yuuki was the true mastermind all along was executed perfectly.
If Episode 10 is any indication, the second half of Season 4 could be the strongest stretch of the show yet. With Yuuki now established as a major antagonist and the Chaos Dragon battle approaching, the stakes have never been higher for Rimuru and the nation of Tempest.
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